Some sculpting brush hotkeys change the view rather than the brush
It seems like you pressed Shift+Numpad 4 which is shortcut to rotate / roll the viewport camera.
Brush shortcuts are numbers on keyboard, not on Numpad. So to activate Sculpt brush from 10 to 20 you press Shift+number on the row of keys above letters on the keyboard. In case of Polish brush this will be Shift+4.

See for more brushes shortcuts Switch between sculpting brushes